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Old 12-09-2012, 08:42 PM   #1
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Registered: Oct 2010
Distribution: Ubuntu Studio
Posts: 13

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No Audio After Using Jack


I suspect / hope I'm missing something really newbish.

I'm running Ubuntu Studio 12.04. My normal audio usually works fine. I can watch YouTube videos in Firefox, play videos or music in VLC, etc., without difficulties.

However, if I start the JACK server, either by running QjackCtl or by starting an application that autostarts it, I can't get regular, non-JACK audio back afterward. Stopping and quitting the JACK server, logging out and back in, and ending and restarting my session don't work. The only way I can get "regular" audio back after using JACK is to restart the computer.

How do I get JACK to relinquish control of my system audio when I'm done with it?

Last edited by Zirbert; 12-09-2012 at 08:43 PM. Reason: (Edited once - so far - for typos.)
Old 12-11-2012, 05:58 AM   #2
Registered: Sep 2005
Distribution: Gentoo, Sabayon, Puppy, Arch
Posts: 165

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Do your desktop programs expect Pulseaudio, and is it running after you start JACK?

I only recently installed Pulseaudio, and had to make a modification in how QJackCtl starts JACK to get JACK to work at all without killing Pulseaudio.

I've never used Ubuntu Studio, but the docs say it usually runs Pulseaudio. I might be reading them wrong.
Old 12-12-2012, 10:10 PM   #3
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Registered: Oct 2010
Distribution: Ubuntu Studio
Posts: 13

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Solved, thanks!

My non-JACK apps do indeed appear to use Pulseaudio (I had no idea until I started digging, at Headrift's suggestion), which JACK was stopping. Starting Pulseaudio back up from the command line ($ pulseaudio --start) after I'm done with JACK gets it going again.


audio, jack, ubuntu, ubuntu studio

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